Yesterday I was told there were Rufous hummers in a horsechestnut tree I was watching, but I didn't manage to capture any. So my hummer list so far consists of three species - Anna's (the most common ones hereabouts), Allen's (seen during the Flyway Festival), and this Costa's (seen at a feeder at Bouverie Preserve). With the chestnuts springing into bloom, maybe I'll see some others on campus this week, before taking off to Norway and Britain for a couple of weeks.